Evaluation of the biocidal efficacy of titanium dioxide coatings for water purification

世界卫生组织估计，世界上一半以上的人口供水受到微生物的污染，其中许多往往是致病性的-强调需要成本效益和无毒的战略来处理大量的水。一个突破性的水处理策略，已获得广泛接受的是分散到供水的纳米光催化剂。当光催化剂暴露于紫外线或可见光范围内的光子时，会产生高活性氧自由基，分解和分解有机分子和微生物，将其转化为水和CO2。一种有前途且广泛使用的光催化剂是二氧化钛（TiO 2），其无毒，不溶于水，耐大多数化学品，如酸、碱或溶剂，并且相对便宜。 不幸的是，纳米颗粒不能容易地从处理过的水中去除。摄入纳米颗粒对人类健康的潜在长期后果是一个主要问题，因为已经注意到细胞系和测试生物体的多种不良影响。模拟公司提出了一种新的战略。将TiO 2晶体分散在粘合剂表面上作为更可行和安全的替代方案，以实现经济和有效的水处理。一种改进的热喷涂工艺正在工程化，以实现高浓度的生物杀灭剂，TiO 2的纳米形式。该拨款提案旨在使用革兰氏阴性、革兰氏阳性和孢子形成细菌评估工程二氧化钛涂层的生物杀灭活性。所产生的数据将在采用固定化技术的水处理厂的工程中发挥关键作用。 TiO 2光催化电池

The World Heath Organization estimates that over half the world's population water supplies are contaminated with microorganisms, many of which are often pathogenic- underscoring the need for cost effective and non-toxic strategies for the treatment of large volumes of water. A breakthrough water treatment strategy that has gained widespread acceptance is the dispersant into water supplies of a nano-photocatalysts. When photocatalysts are exposed to photons in the UV or visible light range, highly reactive oxygen radicals are generated that decompose and disintegrate organic molecules and microbes, transforming them into water and CO2. A promising and widely used photocatalyst is titanium dioxide (TiO2), which is non-toxic, insoluble in water and resistant to most chemicals, such as acids, bases or solvents and relatively inexpensive. Unfortunately, the nanoparticles cannot be easily removed from the treated water. The potential long-term consequences to human health of ingesting the nanoparticles are a major concern since multiple adverse effects have been noted with cell lines and test organisms. A novel strategy proposed by Simulant Inc. is to immobilize Ti02 crystals on adhesive surfaces as a more viable and safe alternative to achieve economical and effective treatment of water. A modified Thermal Spray process is being engineering to achieve high concentrations of the biocidal, anatase form of TiO2. The grant proposal aims to evaluate the biocidal activities of the engineered TiO2 coating using gram-negative, gram-positive and spore forming bacteria. The data generated will play a critical role in the engineering of water treatment plants employing immobilized TiO2 photocatalytic cells.